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(No Model.) I

H. P. UA$E & E. L. GRANGER.

BED PLATES FOR PAPER ENGINES.

No. 248,707. Patented Oct. 25,1881,

NITED STATES PATENT time.

HENRY F. CASE AND EDWARD L. GRANGER, OF SOUTH MANCHESTER, CONN.

BED-PLATE FOR PAPER-ENGINES.

SPECIFICATION forming part of Letters Patent No. 248,707,.dated October25, 1881.

Application filed September 8, 1881. (No model.)

To all whom it may concern Be it known that we, HENRY F. CASE and EDWARDL. GRANGER, of South Manchester, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inBed-Plates for Paper- Engines; and we do hereby declare that thefollowing is a full, clear, and exact description thereof, whereby aperson skilled in the art can make and use the same, reference being badto the accompanying drawings, and to the letters of reference markedthereon.

Like letters in the figuresindicate the same parts.

Our invention relates to what are generally known as paper-engines,being sometimes called washing-engines and beating-engines,accordingtothe work they are intended to perform. In them the paper-stock isreduced to pulp by being carried round and round in a vat, each timepassing between cutters, the upper ones of which are attached to arevolving cylinder and the lower ones are attached to and form part ofwhat is called the bed-plate.

It is especially to the construction of the bed-plate and cutters thatour invention applies.

The object of our improvement is to provide a better method of securingthe cutters to the bed-plate, and in consequence of this new method ofconstruction and attachment to be enabled to make use of a moreefficient form of cutter than has heretofore been in use.

The cutters heretofore employed have either been set in zigzag forminclined to the cutters on the cylinder, or have reached from end to endon a slight angle, in order to shear the material which passes betweenthe edges. They have been made in blocks bolted laterally together, orhave been separated by wooden blocks. When bolted directly together theupper edges have been beveled or chamfered on the backs, so as to form aseries of cutting-edges of the separate plates. With the commonconstruction the spaces between the plates have had a tendency to becomefilled up, and thereby act as a brake upon the cylinder, causing greatfriction and keeping the cutting-edges from operating properly. Theplates have also not been strongly and securely fastened in theirplaces, having a tendency to become loose unless a large number wereused together.

In the accompanying drawings, illustrating our invention, Figure l is asection through the cylinder and bed-plate of a paper-engine, showingthe general relation of the parts. Fig. 2 is a top view of a part of oneof our improved bed-plates. Fig, 3 is across-section of the same throughone of the attaching-bolts.

A is the body of the bed-plate, which is intended to be set in the frameof the machine and securely held in any customary manner.

B and O are cutters. The cutter B is shown as straight from end to endof the bedplatc. The cutter 0 is shown of an improved form, runningacross the machine in a winding or serpentine direction. This form ispreferable to a zigzag made up of separate pieces in the usual manner,as there is no break in the continuity of the edge, and can be readilymade from a straight bar. Our improved construction for holding permitsof this form being used, whereas, by the methods heretofore used, itcould not be held in place. The cutters B and G are set in a recess inthe top of the bedplate A, the outside edges of which are wider apartthan the bottom, so that the cutters incline outward, as shown in Fig.3.

D is a block of the same form as the recess, but narrower by about thethickness of the cutting-blades. It is made so as to wedge in betweenthe cutters, and when forced down clamp them firmly against the sides ofthe recess in the bed-plate.

E E are screw-bolts passing up through the bottom of the bed-plate andworking in hol- 10w threads in the block D. These screws are madesufficiently strong to bind the block D firmly down and clasp thecutting-blades so as to force them into their proper shape. The spacebetween the cutters is left deep and smooth, so that none of thematerial operated upon will be likely to lodge there, and the wide spacebetween the blades offers a free channel to pass along the inclinedportions of the 2. The combination of the curved cutter C. curved bladand over the most salient parts. the straight cutter B, and the devicesA D E [0 What we claim as our invention isfor holding them,substantially as described. 1. In a bed-plate for a paper-engine, the'HENRY F. CASE. 5 combination of the body A, the block D, and EDWD. L.GRANGER.

the bolts E, whereby the cutters are firmly WVitnesses: held and clamIBd in position, substantially as S. M. BENTON, described. W. J. CARR.

